How to Prepare for IB Chemistry Exams: Paper 1A, Paper 1B, Paper 2 and a Smarter Past-Paper Strategy

Six past papers completed. The score has barely moved.

The problem is often not a lack of effort. It is that the student repeats the same revision process—and therefore the same mistakes—between papers.

A past paper should do more than produce a percentage. It should reveal what needs to happen next: relearn a concept, practise a method, improve an explanation, strengthen data analysis or train under time pressure.

If you are a student: this guide will help you identify why marks are being lost and choose the right form of practice.

If you are a parent: you do not need to understand every calculation or mark a Chemistry paper. You need to know whether the revision process is producing visible change.

1. Know what each paper is actually testing

The current IB Chemistry course, first assessed in 2025, uses two externally assessed papers. Paper 1 contains Paper 1A and Paper 1B; Paper 2 contains short-answer and extended-response questions. Together, the externally assessed papers contribute 80% of the final grade. The internally assessed scientific investigation contributes the remaining 20%.1

Component	SL duration	HL duration	Weighting	Main demand
Paper 1	1 h 30 min	2 h	36%	Paper 1A multiple choice plus Paper 1B data and experimental work
Paper 2	1 h 30 min	2 h 30 min	44%	Short-answer and extended-response Chemistry
Scientific Investigation	—	—	20%	Independent scientific investigation

This guide concentrates on the externally assessed papers. The Scientific Investigation is covered separately in the IB Chemistry Scientific Investigation guide.

The important point is not merely that the papers look different. They demand different performance habits:

• Paper 1A rewards accurate chemical decisions made efficiently.
• Paper 1B requires students to reason from data and experimental evidence.
• Paper 2 requires knowledge and reasoning to be made visible through calculations, equations and precise written explanations.

The official IB subject brief describes Paper 1B as containing data-based questions and questions on experimental work. It also states that students are expected to analyse and evaluate experimental procedures, primary and secondary data, trends, patterns and predictions.1

This is why exam preparation cannot consist only of rereading notes. A student may know a topic and still lose marks because the method is unreliable, the evidence is misread, the explanation is incomplete or the paper is not finished.

IB Chemistry examinations also permit the use of a data booklet as a reference aid.2 Students should therefore practise locating and using information efficiently. The first time a student seriously navigates the data booklet should not be on examination day.

IB Chemistry examination skills

Three papers. Three different performance demands.

The Chemistry overlaps, but each paper rewards a different way of working. Preparation combines paper-specific practice with one shared system for correcting lost marks.

Parallel assessment demands

Paper 1A

Multiple-choice questions

Core demandFast chemical decision-making.

Students practise

• Multiple-choice reasoning
• Efficient calculations
• Using the Data Booklet
• Eliminating distractors
• Recognising common traps
• Managing time

Evidence trackedAccuracy, error type and time per question set.

Paper 1B

Data-based questions

Core demandReasoning from experimental and unfamiliar data.

Students practise

• Interpreting tables and graphs
• Identifying variables
• Recognising trends and anomalies
• Evaluating experimental evidence
• Explaining observations precisely

Evidence trackedData interpretation, justification and experimental reasoning.

Paper 2

Written responses

Core demandMaking chemical reasoning visible.

Students practise

• Multi-stage calculations
• Units and significant figures
• Written explanations
• Command terms
• Extended and integrated responses

Evidence trackedMethod marks, chemical precision and completeness.

From lost marks to lasting improvement

Every error must change what happens next.

Another paper is not enough. Each lost mark is diagnosed, repaired and retested until the learning can be used independently in a new context.

The correction sequence

1. 1

   Attempt

   Complete the question without looking at the solution.

2. 2

   Mark

   Mark strictly and identify exactly where credit was lost.

3. 3

   Classify

   Was the problem knowledge, method, explanation, data interpretation or timing?

4. 4

   Repair

   Relearn the concept or practise the missing method deliberately.

5. 5

   Redo

   Solve or rewrite the answer independently without the markscheme.

6. 6

   Retry later

   Test the same idea in a different question after a delay.

Return to mixed practice with stronger evidence.

The error log records the cause, repair action, retry date and later result.

2. Before revising more, diagnose why marks are being lost

Two students can both score 60% and need completely different revision plans.

One may have three substantial knowledge gaps. The other may understand nearly all the Chemistry but work too slowly, misread command terms or fail to show enough working. Giving both students another full paper is unlikely to solve both problems.

Before deciding what to study next, classify why each mark was lost.

Code	Error type	What it means	Appropriate response
K	Knowledge	A concept, fact or chemical relationship is missing	Relearn the concept and use targeted topic questions
M	Method	The topic is partly understood, but the solution cannot be organised reliably	Practise a repeatable reasoning or calculation sequence
E	Explanation	The central idea is present, but the answer is incomplete or imprecise	Identify the missing chemical link and rewrite the response
D	Data/experimental	Variables, units, trends, anomalies, uncertainty or evaluation are mishandled	Use focused Paper 1B and experimental-reasoning practice
T	Timing/attention	Reading, pacing, checking or concentration caused the loss	Use short timed sets and a specific reading or checking routine

“Careless mistake” is not yet a useful diagnosis. Why was the mistake made?

• Was an important word such as excess, initial or best missed?
• Was the unit ignored because the student rushed?
• Was the calculation method insecure, making checking difficult?
• Did one hard question consume the time needed for several accessible ones?

The repair task becomes useful only when the cause is specific.

3. Use a four-stage revision system

Strong exam preparation changes as the student becomes more secure. Full papers are part of the process, but they are not always the correct starting point.

Stage 1 — Diagnose

Begin with a representative mixed set rather than an entire week of rereading.

Record:

• topics that feel insecure;
• calculations where the method is unclear;
• explanations that are almost correct but incomplete;
• data questions that take too long;
• recurring reading or unit errors;
• sections that remain unfinished.

Include short samples of Paper 1A, Paper 1B and Paper 2 work. The goal is to produce a ranked list of the most important recurring weaknesses—not a long, unprioritised list of everything that has ever gone wrong.

Stage 2 — Repair

Now use targeted practice.

If limiting-reactant questions still begin with confusion, work on limiting reactants. If explanations about intermolecular forces repeatedly omit the link to the observed property, rewrite those explanations. If gradients and their units cause trouble, practise them directly.

The aim is not to finish a worksheet. The aim is to remove a recurring weakness.

A topic should not be considered repaired merely because its scheduled week has ended. A better sign is that the student can explain the method and solve a small set of related questions without prompts.

Stage 3 — Mix and specialise

Once individual topics are reasonably secure, mix them.

Mixed questions are valuable because the examination does not normally announce, “This is an equilibrium question; use the equilibrium method.” The student must identify the relevant Chemistry independently.

At the same time, train the three paper formats separately:

• Paper 1A decision-making;
• Paper 1B data and experimental reasoning;
• Paper 2 calculations and written explanations.

Add short timed sets after the method is becoming accurate. Speed built on insecure reasoning usually creates more errors, not fewer.

Stage 4 — Simulate

Full or near-full timed papers now become more useful.

They test several abilities at once:

• knowledge retrieval;
• paper strategy;
• concentration;
• stamina;
• time allocation;
• recovery after a difficult question.

The score is still not the final product. Correct the paper, classify the losses and send the results back into the diagnostic system.

The four-stage revision loop

1. 1
   Diagnose

   Use representative mixed work to identify recurring knowledge, method, explanation, data and timing gaps.

2. 2
   Repair

   Relearn the specific concept or method, then prove it with focused questions.

3. 3
   Mix and specialise

   Mix topics while training Paper 1A, Paper 1B and Paper 2 habits separately.

4. 4
   Simulate

   Use full timed work to test stamina, pacing and recovery, then return to diagnosis.

Correction and retry reveal the next priority.

4. Train Paper 1A as chemical decision-making

Multiple-choice Chemistry creates a particular psychological trap: the correct answer is already on the page.

That can leave a student thinking, “I almost knew it,” even when the underlying reasoning was insecure. Paper 1A should therefore be treated as a chemical decision-making task, not as the “easy paper.”

A reliable Paper 1A workflow

1. Read the stem before becoming absorbed in the options

Identify what the question is actually asking for:

• a quantity;
• a trend;
• a particle or species;
• a relationship;
• the best explanation.

This reduces the chance of allowing a plausible distractor to steer the reasoning too early.

2. Predict before selecting where possible

If the student can predict that a value should increase, that a species should be oxidised or that an answer should fall within a particular order of magnitude, the options become checks rather than suggestions.

3. Eliminate using Chemistry

Distractors frequently reflect familiar errors:

• incorrect sign;
• wrong unit;
• reversed trend;
• forgotten stoichiometric coefficient;
• confusion between amount and concentration;
• incorrect particle or structure;
• correct principle applied in the wrong conditions.

It is not always necessary to prove the correct answer from the beginning. Sometimes the most efficient route is to show why the other options cannot be correct.

4. Calculate only as much as necessary

If the options differ by an order of magnitude, estimate before completing a long calculation. If a relationship settles the question, do not manufacture six lines of arithmetic.

Efficiency is not the same as rushing. It means recognising how much reasoning the question actually requires.

5. Flag and move on when there is no clear next step

One difficult multiple-choice question should not consume the time available for several more accessible questions.

A practical rule is:

If you know the next step, continue. If you are only staring at the options without a route, flag the question and return later.

How to practise Paper 1A

Begin with batches of approximately 10–15 mixed questions. Work accurately before applying severe time pressure. Once the reasoning is becoming reliable, shorten the available time gradually.

For every incorrect response, ask:

1. Why did my chosen option appear plausible?
2. Which chemical idea disproves it?
3. Was the real cause knowledge, method or reading?

Recording only the correct letter wastes much of the learning value.

5. Train Paper 1B as reasoning from evidence

Paper 1B is not simply another test of recalled content. It asks students to work with data and experimental contexts, including situations they may not have seen before.1

The unfamiliarity is part of the task. A student must decide what the evidence shows and then connect it to relevant Chemistry.

A reliable Paper 1B workflow

1. Read the precise task

Determine whether the question asks the student to:

• calculate;
• identify a trend;
• compare;
• explain an anomaly;
• evaluate a method;
• suggest an improvement;
• draw a conclusion.

Do not begin interpreting every number before identifying the job.

2. Identify variables and quantities

Ask:

• What was changed?
• What was measured?
• What was controlled?
• Which quantities are being compared?

Even in a data question that is not a laboratory investigation, thinking in terms of input, response and control can clarify the structure.

3. Check units immediately

Many apparently chemical mistakes begin as unit mistakes:

• Pa versus kPa;
• cm³ versus dm³;
• minutes versus seconds;
• incompatible concentration units;
• a graph gradient with compound units.

Units are information, not decoration.

4. Describe before explaining

First establish what the table or graph actually shows. Then explain the pattern chemically.

A student who begins with a memorised theory may describe a trend that is not present. If the data show an overall increase with one anomalous point, the answer should acknowledge both.

5. Separate evidence from expectation

Theory may predict a particular relationship, but the measurements may contain scatter or an anomaly. A strong conclusion distinguishes the overall evidence from a claim that every result behaved perfectly.

6. Make evaluation specific

“Repeat the experiment” is rarely enough on its own.

State:

• what should be repeated or changed;
• which uncertainty, limitation or source of variation it addresses;
• how the change would improve the quality of the conclusion.

How to practise Paper 1B

Use one complete data set or experimental scenario at a time. After marking, rewrite the conclusion or evaluation rather than merely noting the missing phrase.

For every lost mark, ask:

Which statement is genuinely supported by the evidence, and which statement did I merely expect to be true?

6. Train Paper 2 by making reasoning visible

Paper 2 contains short-answer and extended-response questions.1 It rewards secure Chemistry, but it also requires the method and reasoning to be visible.

A framework for calculations

Use this sequence:

Given information → relevant chemical relationship → equation or formula → substitution → chemically meaningful working → units and sensible precision → final answer checked for plausibility

The most common mistake is to enter arithmetic before identifying the Chemistry.

For example, if a question provides the mass of a reactant and asks for the mass of a product, the underlying route is:

mass of reactant → moles of reactant → mole ratio from the balanced equation → moles of product → mass of product

A student who understands this route can adapt when the question introduces a limiting reactant, percentage yield, solution concentration, gas volume or purity. A student who has memorised a single “mass-to-mass formula” is more likely to become stuck when the context changes.

Show enough working to make the method reconstructable

A useful rule is:

If another IB Chemistry student could not reconstruct how you reached the answer, the working is probably too thin.

This does not mean writing every calculator keystroke. It means showing steps with chemical meaning, such as:

• balanced equation;
• formula or relationship;
• mole calculation;
• stoichiometric ratio;
• equilibrium expression;
• significant intermediate value in a multi-step calculation.

Working helps earn method marks where applicable, but it also helps the student identify their own mistake.

A framework for written explanations

Use:

Claim → chemical reason → link to the question

State what changes. Explain the particle-level, energetic, structural or equilibrium reason. Then connect that reason explicitly to the property or observation in the question.

For example, naming “stronger intermolecular forces” is not always a complete explanation. The answer may also need to connect those forces to the greater energy required to separate particles and therefore to the property being compared.

Common Paper 2 losses

• jumping into arithmetic before identifying the chemical relationship;
• omitting a balanced equation;
• using concentration directly when moles are required;
• presenting a final number with no route;
• missing units or using implausible precision;
• giving a memorised sentence in the wrong context;
• answering a different command term from the one asked;
• describing what happens without explaining why.

After the final number, pause briefly and ask:

Does this result make physical and chemical sense?

A concentration of hundreds of moles per cubic decimetre or a percentage yield far above 100% should trigger a check, even if the calculator followed the entered values correctly.

How to practise Paper 2

Use one multi-part section at a time. After marking, redo calculations and rewrite explanations. Reading the markscheme and thinking “I understand now” is not a reliable test of whether the response can be produced independently.

7. Turn past papers into improvement

Past papers are among the most valuable revision tools available. They are not magic.

A student who does not understand equilibrium will not automatically become secure by completing ten equilibrium questions badly and checking the answers afterwards. A student with weak stoichiometry may complete three full papers and conclude, “I need more papers,” when the real problem is that the mole relationship inside the calculation is still not recognised reliably.

The value of a past paper is created largely during correction.

Use a six-step correction loop

1. Attempt independently

Give the question a genuine attempt without immediate notes, worked examples or markscheme support.

2. Mark strictly

Do not award a mark because the answer feels “roughly similar.” Identify the exact chemical idea, method or evidence that was required.

3. Classify the loss

Use the K, M, E, D or T categories. If several causes contributed, identify the one that should determine the next task.

4. Close the markscheme

The markscheme is a checking tool, not the surface from which the answer should be copied.

5. Recalculate or rewrite

Produce the corrected response independently. For an explanation, include the missing chemical link. For a calculation, redo the route rather than changing only the final number.

6. Retry later

Return to the question or a close variation after several days. If the answer can be produced only because its exact wording is still remembered, the concept may not yet be secure.

Recognition is not mastery. Understanding an answer while looking at it is not the same as producing it independently.

Use markschemes to find the missing idea

A markscheme can help identify:

• the chemical point that was absent;
• the precision the question required;
• whether the method was valid even if the final answer was wrong;
• whether the response answered the command term;
• whether unnecessary writing obscured the scoring point.

Some precise scientific language should be learned. But memorising isolated markscheme sentences is dangerous. The more reliable sequence is:

concept → reasoning → precise language

not:

memorised phrase → hope that it fits

Use older past-paper questions selectively

Questions from an earlier syllabus can still contain useful Chemistry, but they should be mapped carefully to the current syllabus.

Use them to practise overlapping concepts and methods. Do not assume that the previous paper structure, optional content or weighting still represents the current examination. For realistic full-paper simulation, prioritise current-syllabus specimen and examination material available through legitimate channels, including official current-syllabus resources available to schools and teachers.3

Allow enough time for correction

A useful rough principle is to expect serious correction to take a substantial proportion of the original attempt time. This does not mean every 90-minute paper must always require exactly 90 minutes of review. It means correction is a learning session, not the final five minutes before moving to another paper.

Turn a lost mark into a scheduled repair task

Date	Paper/question	Topic	Marks lost	Code	What happened?	Repair task	Retry date	Result
12 Mar	Paper 1A, Q8	Equilibrium	1	K	Assumed a catalyst changes Kc	Relearn rate vs equilibrium position; complete 8 targeted MCQs	15 Mar	7/8 correct
13 Mar	Paper 1B, Q3b	Energetics/data	2	D	Described the trend but ignored the anomalous point	Rewrite the conclusion using overall trend plus anomaly	16 Mar	Secure
14 Mar	Paper 2, Q5c	Solution stoichiometry	2	M	Used concentration directly instead of calculating moles	Complete 5 solution-stoichiometry drills	18 Mar	4/5 correct
15 Mar	Paper 2, Q7a	Acid–base	1	T	Missed the word “excess”	Underline limiting words in the next three timed sections	20 Mar	No repeat

12 MarK1 mark lost

Paper/question

Paper 1A, Q8

Topic

Equilibrium

What happened?

Assumed a catalyst changes Kc

Repair task

Relearn rate vs equilibrium position; complete 8 targeted MCQs

Retry date

15 Mar

Result

7/8 correct

13 MarD2 marks lost

Paper/question

Paper 1B, Q3b

Topic

Energetics/data

What happened?

Described the trend but ignored the anomalous point

Repair task

Rewrite the conclusion using overall trend plus anomaly

Retry date

16 Mar

Result

Secure

14 MarM2 marks lost

Paper/question

Paper 2, Q5c

Topic

Solution stoichiometry

What happened?

Used concentration directly instead of calculating moles

Repair task

Complete 5 solution-stoichiometry drills

Retry date

18 Mar

Result

4/5 correct

15 MarT1 mark lost

Paper/question

Paper 2, Q7a

Topic

Acid–base

What happened?

Missed the word “excess”

Repair task

Underline limiting words in the next three timed sections

Retry date

20 Mar

Result

No repeat

Download the IB Chemistry error-log template

8. Choose a plan for the time remaining

The best balance between topic repair and full-paper practice depends on the student’s foundation and the time remaining. A calendar should guide priorities, not force every student through the same sequence.

If 12 or more weeks remain

Use the complete four-stage system.

• Run a genuine diagnostic.
• Repair major foundations before they become urgent.
• Introduce mixed questions and paper-specific practice gradually.
• Make full timed papers prominent later.
• Keep returning to the error log.

This route provides enough time to improve both Chemistry and examination performance.

If 6–8 weeks remain

Compress the diagnostic, but do not skip it.

• Identify the highest-impact recurring weaknesses.
• Combine topic repair with Paper 1A, Paper 1B and Paper 2 practice each week.
• Begin timed sections earlier.
• Use full papers selectively.
• Correct every substantial attempt completely.

The aim is to repair what still has time to improve while increasing familiarity with the examination formats.

If 2–4 weeks remain

Do not attempt to relearn the entire syllabus.

Concentrate on:

• recurring losses shown by recent work;
• weak but recoverable topics;
• data and explanation precision;
• calculation routes and units;
• timing and question selection;
• realistic examination routines.

Use full or near-full simulation, followed by immediate targeted repair. At this stage, stabilising performance is usually more valuable than constantly changing methods or collecting new resources.

A productive 90-minute revision session

Time	Activity
15 min	Retrieval from earlier topics without notes
30 min	One targeted weakness
30 min	Paper-specific examination questions
15 min	Mark, classify errors and set the next repair task

If the questions are complex, correction should continue beyond the nominal 90-minute session rather than being rushed.

A twelve-week revision roadmap

01Diagnose

02Repair

03Mix

04Paper mode

05Stabilise

1. Weeks 1–2

   Diagnose

   • Mixed baseline
   • Weak-topic map
   • Start error log
   • Data-booklet navigation
   • Baseline for Paper 1A, Paper 1B and Paper 2

   Timed simulation
2. Weeks 3–5

   Repair

   • One or two priority weaknesses each week
   • Targeted calculations
   • Explanation rewriting
   • Short Paper 1A sets
   • One Paper 1B scenario each week

   Timed simulation
3. Weeks 6–8

   Mix

   • Mixed-topic questions
   • Longer Paper 2 sections
   • Timed Paper 1A blocks
   • Experimental and data practice
   • Revisit error-log patterns

   Timed simulation
4. Weeks 9–10

   Paper mode

   • Full or near-full timed papers
   • Realistic examination conditions
   • Serious correction sessions
   • Next-day targeted repair

   Timed simulation
5. Weeks 11–12

   Stabilise

   • Recurring small losses
   • Timing and checking
   • Data and explanation precision
   • Familiar examination routine
   • No attempt to restart the entire syllabus

   Timed simulation

Planning model—not an official IB timetable.Adapt it to school workload, SL/HL level and the student’s starting point.

9. Parents: support progress without taking over

Parents do not need to mark Chemistry papers themselves. The most useful evidence is not the number of hours studied or papers completed, but whether the student’s revision process is becoming more specific and effective.

Signs that revision is working

• The student can name weak areas precisely.
• The same error occurs less frequently.
• A substantial part of revision time is spent correcting work.
• Timed scores become more stable.
• The student can explain why an answer was wrong.
• Unfamiliar questions cause less panic.
• The next revision task is connected to evidence from the previous one.

Warning signs

• Many papers are completed, but there is no error log or repair plan.
• The same mistakes appear repeatedly.
• Revision consists mainly of rereading notes or watching videos.
• Study hours increase, but the student cannot explain the plan.
• Timed performance deteriorates sharply.
• The student cannot explain why their answer differs from the markscheme.

A parent’s progress dashboard

Signs of real progress

• Weak areas are named specifically
• Repeated errors are decreasing
• Correction is visible in the schedule
• Timed results are becoming more stable
• The student can explain the next step

Activity without clear progress

• More hours, but no clear diagnosis
• Many papers, but no error log
• The same losses keep returning
• Revision is mostly passive
• No change follows correction

Ask: “What did this paper teach you to do next?” Not only:“What score did you get?”

Questions parents can ask

Instead of focusing only on volume or score, try:

• “Which type of mistake appeared most often?”
• “What will you change before the next paper?”
• “Which weakness improved this week?”
• “Do you need help with a concept, a method or the study plan?”

Less helpful questions include:

• “How many papers did you finish?”
• “Why is your friend scoring higher?”
• “You studied for hours—why did the score not improve?”

The aim is not to remove standards or ambition. It is to direct attention toward a process the student can improve.

10. The final week, exam day and when to ask for help

During the final week

Use the last days to stabilise performance.

• Review recurring error-log patterns.
• Revisit a small number of specific repair tasks.
• Practise locating information in the data booklet.
• Maintain a familiar examination routine.
• Check timing strategies and flagged-question routines.
• Avoid trying to restart the entire syllabus.
• Protect sleep and concentration.

The goal is not to feel that every possible Chemistry question has been completed. The goal is to enter the examination able to use the knowledge and methods already built.

Paper 1A checklist

• Read precisely.
• Predict where possible.
• Eliminate chemically impossible options.
• Calculate only as much as necessary.
• Do not let one question consume excessive time.
• Return to flagged questions.

Paper 1B checklist

• Identify variables and units.
• Describe the evidence before explaining it.
• Distinguish the overall trend from anomalies.
• Use data to support conclusions.
• Make limitations and improvements specific.
• Check whether the answer addresses the exact task.

Paper 2 checklist

• Identify the command term.
• Show chemically meaningful working.
• Use balanced equations where relevant.
• Include units and sensible precision.
• Write concise causal explanations.
• Check whether the result is physically plausible.
• Leave time to return to unfinished parts.

When should a student ask for help?

Ask for help when a pattern persists despite genuine independent correction.

Examples include:

• stoichiometry feels like a completely new problem every time;
• organic mechanisms are memorised but not understood;
• Paper 1B data questions remain consistently weak;
• explanation marks are repeatedly lost;
• performance drops sharply under timed conditions;
• the student cannot understand why their response differs from the markscheme.

Do not wait until the final two weeks if the underlying problem is conceptual. Exam technique can be polished relatively late. Foundational understanding usually needs more time.

The central idea

You do not improve at IB Chemistry simply by completing more past papers.

You improve when exam questions are used to build four things:

1. secure Chemistry knowledge;
2. reliable problem-solving methods;
3. paper-specific performance skills;
4. a correction system that prevents the same error from returning.

Past papers are among the best tools available. But the tool works only when every paper teaches the student what to do next.

Frequently asked questions

When should I start using IB Chemistry past papers?

Begin with small, syllabus-relevant sections during topic learning. Students do not need to wait until every topic is perfect. However, full timed papers become most valuable once the major content gaps have been repaired sufficiently for the result to reveal examination-performance issues rather than only missing knowledge.

Can I use papers from the previous syllabus?

Yes, selectively. Use questions that still match the current Chemistry content and skills. Do not treat the older paper structure, options or weighting as a model of the current examination. Prioritise current-syllabus material for full simulation.

How many full papers should I complete each week?

There is no universal number. The appropriate frequency depends on the time remaining, the student’s foundations, school workload and whether each paper can be corrected properly. One carefully corrected paper can produce more improvement than several papers completed without diagnosis or repair.

How should I use the markscheme without becoming dependent on it?

Attempt the question first. Mark strictly, identify the missing idea, close the markscheme, rewrite or recalculate independently and retry later. The purpose is to understand the scoring point and the Chemistry behind it—not to memorise an isolated sentence.

How can parents help if they do not understand Chemistry?

Monitor the process rather than trying to become the examiner. Look for specific weak areas, serious correction, decreasing repetition of the same error and more stable timed performance. Ask what the student learned from a paper and what will change next.

References

1. International Baccalaureate, Diploma Programme Subject Brief—Sciences: Chemistry, first assessment 2025
2. International Baccalaureate, What is good practice for Open Book Assessment?
3. International Baccalaureate, IB Questionbank